66037501 has 4 divisors (see below), whose sum is σ = 66090492. Its totient is φ = 65984512.

The previous prime is 66037487. The next prime is 66037507. The reversal of 66037501 is 10573066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43956900 + 22080601 = 6630^2 + 4699^2 .

It is a cyclic number.

It is not a de Polignac number, because 66037501 - 2¹⁹ = 65513213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66037501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66037507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24580 + ... + 27133.

It is an arithmetic number, because the mean of its divisors is an integer number (16522623).

Almost surely, 2^66037501 is an apocalyptic number.

It is an amenable number.

66037501 is a deficient number, since it is larger than the sum of its proper divisors (52991).

66037501 is a wasteful number, since it uses less digits than its factorization.

66037501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52990.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 66037501 is about 8126.3461038772. The cubic root of 66037501 is about 404.2005282479.

The spelling of 66037501 in words is "sixty-six million, thirty-seven thousand, five hundred one".